National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaRiver Group: San Joaquin
Monitor Stage: N/A Flood Stage: 7.5 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View USGS Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2022
2,430
6.25
Oct 25, 2021
2021
1,410
5.02
May 7, 2021
2020
2,160
5.96
Apr 30, 2020
2019
4,240
7.79
Jun 13, 2019
2018
8,060
10.09
Apr 7, 2018
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present) - Ranked by Flow
1997
10,100
13.27
Jan 2, 1997
1956
9,840
12.73
Dec 23, 1955
1951
9,260
11.55
Nov 18, 1950
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ324)
Today: Mostly cloudy. Patchy blowing snow early in the morning. Snow early in the morning, then chance of snow in the late morning and afternoon. Snow accumulation of 1 to 3 inches. Total snow accumulation 2 to 15 inches. Highs 32 to 40. Southwest winds 5 to 15 mph. Chance of snow 80 percent.

Tonight: Mostly cloudy with a 50 percent chance of snow. Lows 20 to 26. South winds 5 to 10 mph shifting to the east after midnight.

Monday: Partly sunny. Highs 36 to 44. East winds up to 5 mph shifting to the southwest in the afternoon.

Monday Night: Mostly cloudy. Lows 28 to 34. Southeast winds up to 5 mph.

Tuesday: Mostly cloudy. Chance of rain and snow in the afternoon. Highs 40 to 48. South winds up to 10 mph. Chance of precipitation 50 percent.

Tuesday Night and Wednesday: Mostly cloudy with a 50 percent chance of rain and snow. Lows 29 to 35. Highs 40 to 48.

Wednesday Night: Mostly cloudy with chance of rain in the evening, then partly cloudy after midnight. Lows 26 to 32. Chance of rain 30 percent.

Thursday: Mostly sunny. Highs 42 to 50.

Thursday Night and Friday: Mostly clear. Lows 26 to 32. Highs 47 to 55.

Friday Night: Mostly clear. Lows 31 to 37.

Saturday: Mostly sunny. Highs 45 to 53.
Impacts - E19 Information
7.0 FeetCampgrounds at North Pines and Lower Pines begin to flood.
7.5 FeetHousekeeping Camp and Yosemite Valley Backpacker Campground begin to flood.
10.0 FeetNorthside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan Crossover, and Sentinel Crossover are impassible to vehicles.
13.27 FeetFlood of record - January 2, 1997. $178M in damage to Yosemite Valley.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Joaquin Valley-Hanford Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.